Cannot build IDL because of duplicate discriminator in declare_program macro

[CanardMandarin]

When using the declare_program macro, account name collisions can occur because many programs use generic names for accounts.

For example, if I have an account named vault and the IDL of the external program also defines a vault account, the following code will result in an IDL build error:

use crate::external::accounts::Vault as ExternalVault;

#[derive(Accounts)]
pub struct Init<'info> {
    pub vault: AccountLoader<'info, Vault>,
    pub external_vault: AccountLoader<'info, ExternalVault>,
} 

This will throw the following:

Error: Ambiguous discriminators for accounts Vault and ExternalVault

I'm seeing multiple solution here:

1. Add a skip-idl-verify flag for advanced use of anchor
2. Make discriminators program dependent

"accounts": [
  {
    "name": "Vault",
    "discriminator": [],
    "programId": "11111111111111111111111111111111"
  },
  {
    "name": "Mint",
    "discriminator": [],
    "programId": "TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"
  }
],

3. Exclude external accounts (from declare_program macro) from the IDL generation? (I'm afraid it might break stuff)